Add nth-child feature-detect
Fix indent, single-quotes and leaking i
Updated flexbox tests to better capture all 3 specs; fixes #812
polyfill HTML5-History-API falls at initialization in IE6+

polyfill [HTML5-History-API](https://github.com/devote/HTML5-History-API) creates a new `history` object by means of VBScript, and if there was an appeal to the property `history` as global variable omitting the `window.` Library [HTML5-History-API](https://github.com/devote/HTML5-History-API) initialization fails.
Modify CSS Exclusions to CSS Shapes, since we split up the specification. Update references.
Modify CSS Exclusions to CSS Shapes, since we split up the specification. Update references.
Add input[directory] test
Add nth-child feature-detect
Fix indent, single-quotes and leaking i
Merge branch 'master' of github.com:emilchristensen/Modernizr
Move and rename file to new structure. Rewrite test to use Modernizr v3 AMD structure
Added DOC block with description of how the test works
Fixed @sindresorhus' line comment about spacing concerning anonymous functions
Metadata / DOC improvements:
- Moved 'how it works' out of DOC block (this is for user documentation, rather than maintainer/implementation documentation – I've also clarified this on [the wiki](https://github.com/Modernizr/Modernizr/wiki/Authoring-a-v3-test))
- Turned `"authors"` and `"warnings"` fields into arrays
- Corrected `"property"` field to match name used in `Modernizr.addTest()` (these must be the same)
Merge pull request #1 from stucox/emilchristensen-master

Metadata / DOC improvements
Add nth-child feature-detect
Merge branch 'master' of github.com:emilchristensen/Modernizr
Merge pull request #685 from emilchristensen/master

Add feature detect for nth-child()
Merge pull request #936 from stucox/flex

Updated flexbox tests to better capture all 3 specs; fixes #812
Simplify mathml test and remove async stuff. Fixes #682